ABB 3BHE029153R0101 UNS0119A-P module

ABB 3BHE029153R0101 UNS0119A-P module

Technical data of product parameters

The VON counter is used to 3BHE029153R0101 UNS0119A-P temporarily stop the DMA from transferring data once a programmed number of bytes have been transferred (256 bytes, 512 bytes,1K, 2K, 4K, 8K, or 16K). When performing MBLT transfers on the VMEbus, the DMA will stop performing transfers within 2048 bytes after the programmed VON limit has been reached. When not performing MBLT transfers, the DMA will stop performing transfers within 256 bytes once the programmed limit has been reached. When programmed for Release-When-Done operation, the Universe II will perform an early release of BBSY* when the VON 3BHE029153R0101 UNS0119A-P counter reaches its programmed limit. VON may be disabled by setting the field to zero. When set as such, the DMA will continue transferring data as long as it is able. There are other conditions under which the DMA may relinquish bus ownership. VOFF affects how long the DMA will wait before re-requesting the bus after the VON limit has been reached. By setting VOFF to zero, the DMA will immediately re-request the bus once the VON boundary has been reached. Since the DMA operates in a round-robin fashion with the PCI Target Channel, and in a priority fashion with the Interrupt Channel, if either of these channels require ownership of the VMEbus, they will receive it at this time. VOF 3BHE029153R0101 UNS0119A-PF is only invoked when VMEbus tenure is relinquished due to encountering the VON boundary. When the VMEbus is released due to other conditions (e.g., the DMAFIFO has gone full while reading from the VMEbus), it will be re-requested as soon as that condition is cleared. The VOFF timer can be programmed to various time intervals from 0µs to 1024µs.

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